Cutter-sharpener.



c. F. DRAPER'.

CUTTER SHARPENER.

APLlCATlON FILED MAR. 9. 1918y atented Mm'. 4, N19.

new and yuseful Improvements. in Cutterv Sharpeners,

specification, reference being'had to the acfi; manna* namen.

" TED sra oHnaLEs F. DRAPER, or LANCASTER, PENNSYLVANIA.

CUTTER-SHARPE-NER.

Specication of Letters Patent.

Patented Mar. 4, 1919.

l Application ned Maren 9, 191s. serial No. 221,523.

To all whom t mciylconcem:

Beit known th'atI, CHARLES F. DRAPER, a citizen of the4 United States, residing at Lancaster, in the county of Lancaster and State of Pennsylvania, have invented certain vof which the following is a companying drawings.

This invention relates to means for sharpening the cutters of lrotary cutter heads, and particularly to a\cutter 'Sharpener which 1s adapted to sharpen knives supported in the -knife mounting|` which forms the subjectv matter of a separate application,'Serial No.

' 221,522, filed by meon the 9th day of March, V1918. i

The generalobjectv of this invention is tol provide a sharpening device so constructed that the cuttngknives shall be beveled to the correct anglefwithout the necessity of skilled labor on` the part of the workman' A further object is to provide a'device of this character in which the cuttingjknives may be shifted outward to any deslred eX- er and'have the correctangle. f

A- further Objectis to provide'a device of i ,this 'Character which is reeiproeatable along -the length of the cutter head.

` Other objects will appear in the course of` the followin description.y I My invention is illustrated 1n theaccom- 1 panying drawings, wherein tive the sharpening devicev therefor;

Figure 1 is a sectional view of one form of cutter head with my improved knifer mounting thereon andr showing in perspecand rear beds showing my sharpening de vice applied thereto;

F ig.l 4 is a lfragmentary sectional view of a cutter head showing a modified form of means for holding -theabrading member;

Fig. 5 is a fragmentary perspective view of a -p'art of the knife Sharpener showing -abrading member holding means, the view being partly in section; and

Fig. 6 is a sectional view showing means for mounting a rotatable file in the head of the Sharpener.

Referring to these drawings, 10 desigknife mounting comprises the chip plate 11,v

and the -cap plate 12, between which the knlfe or'cutting blade 13 is mounted. The

'cap plate 12 and .the plate 11 are held to each other and to the cutter head by means of equidistant screws 14 or inr any other suitable manner and preferably the cap plate and the chip plate are formed with a coacting groove and rib, the -rib being designated 15 whereby the cap plate and chip plate are held in proper relation to each other so as to support the knife 13.

F orthe purpose of sharpening the knife 13 and givlng it correct bevel I provide the sharpening device illustrated in Fig. 1 comprising a body 16, which is curved to arch over t end is cut away as at 17 to fit upon the corner of the cap plate 12. end of the body 16 is formed with a downwardly extending lu 18 which constitutes a stop and whose un er face is smooth and rests upon the beveled face of the cap plate 12. Also attached to the body 16, at its vextremity, is an abrading member clamping means, in this case illustrated as a barrel `19, through which a certain form of abradlng member20 is disposed. This abrading member 20 is preferably of soft iron whose extremity has been impregnated with carborundum, diamond dust, or other suitable.

abrading agents. With the device as illustrated it is possible to reciprocate the body 16 back and forth over the face of the cap plate and thus grind the beveled face of the ,knifelS to an angle the saine as that of the beveled face of the cap 12. rlhe body 16 is about 4f .long so as to securealirm i bearing uponthe rear corner of thefcap The opposite plate 12 and upon the face of the bevelledll/O portion thereof.

It will4 be obvious that with this construction the stop' 18 bears upon ,the face of the cap-12 and the abrading member o1`1ly bears upon the cutter so that the rap 12 1s not injured by contact with the file. From time to time the knife 13 may be shifted outward as by means of drifts inserted through open-4 e ings 21 in the rear end o f the riap plate, and the knife 13 mav be dr1ven Qlit to any desired extent and' then the abrading member will cut the knife down until the upper face of the knife is in line with the plane of the inclined face of the cap 12, thus always keeping the knife true and preventing the knife projecting beyond the chip plate and beyond the cap plate more than a predetermined amount.

lIn Fig. 2 I illustrate a. cylindrical cutter head having a knife 13*L and formed at intervals with the recesses 22 to receive the knife blades.4 IVhlle my improved mounting may be used in connection with the cylinvdrical mittel-.head I havenot illustrated it so but illustrated an ordinary knife held in place within one of the recesses by meansof the usual bolts. In this case the body 16` at its rear end engages over the corner of one of the recesses while theabrading member 20 engages with the beveled face of the knife. The lug 1S in this case rests upon the face ofthe cylindrical. cutter head and limits the inward movement of the file.

In- Fig. 3 I show the manner in which a sharpening device of the forln described for Figs. 1 and 2 is adapted to be used in conf V the forward edge of this strip so as to guide the Sharpener as it is reciprocated. 'The v'body 16a is formed with the barrel 19n to receive the abrading memberl in the manner illustrated in Fig. 1, or preferably as illustrated in Fig. 6, the detailed construction illustrated in Fig. 6 being later described.

In Figs. 4 and 5 I illustrate a manner of mounting a small rectangular abrading member on my improved sharpening device without the necessity' of using the form of an abrading member illustrated in Figs. 1, 2, 3 and 6. In this case the body 16 of the sharpener is formed with a flange 24 on its under face, this flange having a Veshaped longitudinally extending recess upon its inner face. The extension 25 of the body 16 is slotted as at 26 and attached to the outer face of the ex tens1on is a spring 27 which extends down `lar abrading member 38.

through said recess and is formed to provide vthe V-shapecl groove 28. This V-shaped groove and recess and the V-shaped recess on the flange 24 are adapted'to engage the abrading member 29, which is formed with beveled faces on its opposite side edges. The resiliencevof the spring 27 urges its depending portion toward the flange 24 and thus clamps the abrading member in position. Under these circumstances, the file may be shifted in the guideways formed in the flange 24 .and by the recess 28 so that as the abrading member is used it may be shifted inward to bring a new surface into contact with the knife being sharpened and thus the whole surface of the abrading member may be used. Of course after the abrading memf ber has been shifted inward to bring 'a fresh surface against the blade 13, the worn sur-4 face of the abrading member will bear against the beveled face of the cap plate 12,

but `inasmuch as this face of the abrading member has been worn away, `it will not abrade the cap plate. The body 16 is provided with the r'ib 18 which'bears upon the cap plate and thus supports the abrading' I member 1n proper position.

In Fig. 6 I show means formounting a rotatable abrading `member `in my reciprocating sharpening device so that as the Sharpener. is reeiproc'ated the abrading member will rotate to therey bring a fresh surface into Contact with the cutting knife. In this case, the body 16 is formed with a head 19*L which is recessed or otherwise formed to provide a relatively enlarged chamber screw-threaded as at 30 for a p0rtion of its length and provided atlits upper lend with the inwardly extending flange 31.

Disposed with its lower end in this chamber is a` barrel 32 having a flange 33 at its.

lower end which confronts the flange 31 and disposed between these flanges are the antifriction rollers 34. A screw-threaded locking nut engages the screw-threaded portion of the chamber and holds the flange 32 in engagement with the balls-34- The barrel 32 is interiorly screw-threaded and engaging the sf 3rewthreads of the barrel is a disk 36and riveted to the under face of this disk, so as to be held from rotative engagement around the rivet is a cap 37 in whichis inserted the outer end 4of an annumember may 'be made 4of carborundum, ernery or any other suitable abrading material and wlth the cap has free rotation around the pivot or axis formed by the rivet. The plate 36 is formed with recesses or perforations 39, whereby a wrench may be applied to rotate the disk or plate' to thereby urge the file downward from time to time and the upperend of Athe barrel is closed by a plate 40 having screw-threaded engagement with the barrel and also formed This abrading This disk 39 constitutes a jam nut which,

when turned down, prevents reverse rotation of the disk 36 and thereby holds the file set in its adjusted positions. Otherwise than this, the construction illustrated in Fig. 6 is exactly the same as that illustrated in Fig. 1.

While I have illustrated a 4number of different forms of my invention, these are to illustrate the fact that it may be modified in manyv ways without departing from the spirit of the invention and may be used in connection with various forms of cutting heads and knives. 'In all ot these forms there is a stop limiting the downward movement of the sharpening device and in all of these forms the sharpening device is reciprocated by hand longitudinally of thecutter head to sharpen the knife. While this device is particularly adapted for -use with a knife mounting including' a cap plate having a 'beveled face, I do not wish to be limited to this, Aas the sharpening device n'lightv be formed with a stop engaging the cutter head itself, as in Fig. 2..

Having described my invention, what -I claim is:

l. A knife sharpening device of the character descgibed comprising a body, the body being provided with a hollow head at one end having an inwardly extending annular flange, a barrel insertible through the head /andhaving on its under end an outwardly extending flange, balls disposed between the flanges and permitting the rotation of the 4o barrel relative to the head, a disk having screw-threaded engagement with the barrel,

acter described means for locking the disk in engagement with the barrel, and an annular abrading` member operatively connected to. the disk and disposed concentrically to the barrel.

2. A knife sharpening device of the char- ,comprising' al body having a head at one end, the head being formeddo provide a chamber having an overhanging lfian', ,fre`at its upper end, a barrel rotatably mounted in the head and having interior screw-threads, ant1-fr1ction devices disposed between the barrel and the head'and permit` ting the rotation of the barrel relative to the head, and an annular abrading member adjustably mounted upon the barrel and rotatable therewith.

3. A knife sharpening device ot' the character described comprising a body having a head at one end, the head being formed to provide a chamber having overhanging -"1nges at its upper end and screw-threzuled at its lower end, a barrel inscrtible through the head and having. an Aannular flange at its lower end confronting the first named flange, anti-friction devices disposed between the flanges, a nut engaging the screw threaded end of the head and holding the fianged end of the barrel in place, a disk having screw-threaded engagement with the interior of the barrel, a cap mounted thereon,an annular abrading member carried by the cap, and a Jam nut engaglng the threads of the barrel and holdlng the disk in adjusted position therein.

In testimony whereoiLl I hereuntoafiix my signature in the presence of two wltnesses.

CHARLES I". DRAPER. Wvitnesses:

Vin-II. BROWN, A. I1". SIIENCK.' 

